Guitar Hero 3= $9.50
Phat PS2= $30
Time Crisis 4= Don't know, but it definitely not worth enough to get you to $70.
Guncon= IDK either, but it's counted separately from the game.

In order to maximize your credit, you need to trade in more then 6 games to get the 40% boost in TIV (50% if you have an Edge card). The 2 will only get you a 10% increase (only in the games, not the PS2 or Guncon).

I might sell my ds games too, so that gives me 6 games + the bonus which would give me 60 - 70 dollars ish total probably + I just found my old ddr game(its probably like 5 dollars lol) but anyway yeah, that should be good enough, and I might sell my flashcard to my friend seeing as I need to get an acekard 2i anyway + I found $15 dollars so with all that my cash total without the stuff I just found should be around 30 dollars.